218324 2020-10-28 23:12:53 -0700 REGRESSION(r269065): [GPU Process]: Order of drawing has to be preserved when drawing a canvas to another canvas 2020-10-29 13:28:26 -0700 1 1 1 Unclassified WebKit Canvas WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=217566 InRadar P2 Normal --- 1 sabouhallawa sabouhallawa dino simon.fraser thorton webkit-bug-importer wenson_hsieh oldest_to_newest 1702632 0 sabouhallawa 2020-10-28 23:12:53 -0700 When drawing an ImageBuffer to another ImageBuffer, the DrawingContext of the source and the destination ImageBuffers have to be flushed immediately. Otherwise an older version or a newer version of the source ImageBuffer might be drawn to the destination ImageBuffer. Consider this example and assume GPU rendering is enabled for canvas. <script> var canvas1 = document.getElementById('canvas1'); var canvas2 = document.getElementById('canvas2'); var canvas3 = document.getElementById('canvas3'); var ctx3 = canvas3.getContext('2d'); ctx3.fillStyle = 'red'; ctx3.fillRect(0, 0, 100, 100); var ctx1 = canvas1.getContext('2d'); ctx1.drawImage(canvas3, 0, 0); ctx3.fillStyle = 'green'; ctx3.fillRect(0, 0, 100, 100); var ctx2 = canvas2.getContext('2d'); ctx2.drawImage(canvas3, 0, 0); ctx3.fillStyle = 'blue'; ctx3.fillRect(0, 0, 100, 100); </script> 1. If we do not flush any of the canvases after the "drawImage" calls, the first two canvases will not be drawn. This means an older version of canvas3 is drawn to canvas1 and canvas2. 2. If we flush canvas3 after the "drawImage" calls, all the canvases will be filled with blue. This means a newer version of canvas3 is drawn to canvas1 and canvas2. 1702634 1 412616 sabouhallawa 2020-10-28 23:16:43 -0700 Created attachment 412616 Patch 1702796 2 ews-feeder 2020-10-29 11:36:03 -0700 Committed r269159: <https://trac.webkit.org/changeset/269159> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412616. 1702798 3 webkit-bug-importer 2020-10-29 11:37:17 -0700 <rdar://problem/70818638> 412616 2020-10-28 23:16:43 -0700 2020-10-29 11:36:03 -0700 Patch bug-218324-20201028231642.patch text/plain 9384 sabouhallawa U3VidmVyc2lvbiBSZXZpc2lvbjogMjY5MTIzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMjQxNDMwNDYyOTQ5Y2Rh NjE3OGMxYWMyODRjMzJhZTM3ODllMmFhZi4uZWNmMmY1OTMwOTc2NThmNTgyNDk0ZmIxZWNhYzQ3 NTQwZWRiNmU2YSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIyIEBACisyMDIwLTEwLTI4ICBTYWlk IEFib3UtSGFsbGF3YSAgPHNhaWRAYXBwbGUuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04oMjY5 MDY1KTogW0dQVSBQcm9jZXNzXTogT3JkZXIgb2YgZHJhd2luZyBoYXMgdG8gYmUgcHJlc2VydmVk IHdoZW4gZHJhd2luZyBhIGNhbnZhcyB0byBhbm90aGVyIGNhbnZhcworICAgICAgICBodHRwczov L2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjE4MzI0CisKKyAgICAgICAgUmV2aWV3 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